NO AC IN TEXAS..... PLZ HELP :(

[TurboTdr3.8]

I just put 12v to terminal B on the AC relay harness and the AC clutch kicks on - maybe it is the relay itself - any way to test it?

No more than they cost I would have one and then you would know . I bought one at Advance Auto for 14.00 bucks the other day trying to fix my problem .

 

[85mustangkiller]

Here's some basic trouble shooting. Would be easier if you had a manifold set to read pressures.
The Compressor will not Engage

If the machine is equipped with the protection system for the refrigerant compressor, Refer to the Service Manual, SENR 3334, "Troubleshooting Heating and Air Conditioning Control Systems" in order to test the on delay timer assembly for the refrigerant compressor.
System Condition 13

1. Low pressure gauge reading is above normal. For normal operating pressures, refer to Table 2.

1. High pressure gauge reading is below normal.For normal operating pressures, refer to Table 2.
   Note: Ambient temperature is above 21°C (70°F).

1. Air flow to the operator's compartment is warm.

Probable Cause

1. The thermostatic switch is stuck open. This does not allow the magnetic clutch to cycle the compressor.
   1. Check the wire connectors on the thermostatic switch and on the magnetic clutch.

1. The connection of wire leads on switch is improper. The connection of wire leads on the magnetic clutch is improper.
   1. Check for insulation that is broken. The insulation failure can expose the wires from the switch to the magnetic clutch.

1. The wire that connects the switch to the magnetic clutch has an opening.
   1. Check the resistance of the coil with a multimeter. Refer to the Service Manual, SENR3334, "Refrigerant Compressor" section in Specifications for your compressor.
   1. Check for the proper electrical ground at the magnetic clutch.
   1. Touch the two wires on the switch together. Check for the proper operation of the magnetic clutch.
   1. In order to check the electrical components, refer to Service Manual, SENR3334, "Troubleshooting Heating and Air Conditioning Control System" in Testing and Adjusting.
      If the problem is a loose wire on the switch or a loose wire on the magnetic clutch, make the repairs that are needed. If the wires to the clutch were damaged, the damaged wires can cause the switch to remain open. Make the needed repairs to the damaged wires. In order to ensure the correct system operation, perform a performance check.

1. The charge of refrigerant in the capillary tube (thermostatic switch) has been lost.
   1. If the capillary tube has no charge or the switch remains open, the problem is in the thermostatic switch.
      • Replace the switch.
      • In order to ensure the correct system operation, perform a performance check. Refer to "Performance Checks for the Air Conditioning System" section.

 

[fitz3820]

Strange - when I jumper the B and D terminals on the AC relay harness sometimes the clutch engages, sometimes it does not...

Is there a ground that I could be missing?

 

[85mustangkiller]

I would think it could be a switch not working right.

 

[85mustangkiller]

If the low pressure switch is stuck open in wont complete the ground circuit to the clutch

 

[fitz3820]

Thank you all- it turned out to be a bad connection between the high pressure cut off switch and the connector on the harness - runs like a champ now though the compressor is pretty loud.

Thank you all for your your help!

 

[thenasty6]

Thank you all- it turned out to be a bad connection between the high pressure cut off switch and the connector on the harness - runs like a champ now though the compressor is pretty loud.

Thank you all for your your help!

congrats glade u got it working! a/c can be a beautiful thing?

 

[fitz3820]

It has been really hot for us here in New England - need the AC!